Too much surface Garden Protection lying water can starve the roots of oxygen and lead to the same symptoms (leaf rolling) as lack of water.
It is important to know when to water rather than just watering because you think a lawn needs watering.
There are a few basic tests you can do to know if your lawn needs irrigation.
Look for leaf rolling and curling and the slightly blue/purple tinge which comes when grass is being starved of moisture.
Also, try the foot print test. Stepping on a healthy lawn should see it spring back into position quickly but if your lawn is slow to react then it's time to add more water.
The key thing to remember here is that the object of mowing a lawn is lawn "mowing" not lawn "scalping"!
To take good care of your lawn you need to make sure you are mowing with sharp lawn mower blades so you cut rather than rip at the grass and ensure you do not set the blades at too low a level as you do not want to cut it back lower than is recommended for your particular species of grass.
Cutting too low on a regular basis is the easiest way to do lasting damage to your lawn.
If your lawn has become too overgrown then do two or more passes with your mower rather than trying to take it right down to a desirable length straight away and never cut grass when it is wet.
Grass clippings may be left or raked as you please if you do not have a lawn mower with a grass Pop-up Greenhouse collector.